Spin-fluctuation mechanism of superconductivity
arXiv:cond-mat/0506726 · doi:10.1117/12.621848
Abstract
Normal and superconducting state spectral properties of cuprates are theoretically described within the extended t-J model. The method is based on the equations of motion for projected fermionic operators and the mode-coupling approximation for the self-energy matrix. The dynamical spin susceptibility at various doping is considered as an input, extracted from experiments. The analysis shows that the onset of superconductivity is dominated by the spin-fluctuation contribution. The coupling to spin fluctuations directly involves the next-nearest-neighbor hopping t', hence Tc shows a pronounced dependence on t'. The latter can offer an explanation for the variation of Tc among different families of hole-doped cuprates. A formula for maximum Tc is given and it is shown that optimum doping, where maximum Tc is reached, is with increasing -t' progresively increased.
Strongly Correlated Electron Materials: Physics and Nanoengineering Symposium: AM05 Optics & Photonics 2005 (inv.)
References in corpus (8)
- Superconductivity in the two-dimensional t-J model
- Enhancement of Pairing Correlation by t' in the Two-Dimensional Extende d t-J Model
- Magnetic fluctuations and resonant peak in cuprates: a microscopic theory
- Scaling of the magnetic response in doped antiferromagnets
- Spin-fluctuation mechanism of superconductivity in cuprates
- Operator projection method applied to the single-particle Green's function in the Hubbard model
- Crossover to non-Fermi-liquid spin dynamics in cuprates
- Spin-fluctuation mechanism of superconductivity